Air and gas mixing valve



Jana-23,, 1923v 1,442,971., T; E. ROOKE.

AIR AND GAS MIXING VALVE.

FILED FEB. 25. 192:.

Patented Alana E3, 'Wfld.

dlhlhd TOM 1E. ROOKIE, 0F CEDAR RAPIDS, IOWA, ASSIGNOR TO THE JOHNElON GAS APPLIANCE COMPANY, OF CEDAR RAPIDS, IOWA.

AIR AND ens MIXING VALVE.

Application filed February 25, 1921. Serial No. 447,790.

To all whom it may concern: I

Be it known that l, ToM E. Rooms, a -iti.zen oi? the United States, and resident of Cedar Rapids, in the county of Linn and State of Iowa, have invented a certain new' stoves, and which embody in their construction a valve for controlling the supply of gas being fed to the burner, and also a gas port, the area of which is automatically adjusted by the movement of the gas valve, so that when the gas valve is only slightly opened the area of the port will be relatively small, and when the gas valve is wide open the area of the port will be relatively large so that substantially the same amount of gas pressure at the discharge port is maintained during all positions of the valve.

My object is to provide a device in the nature of an attachment "for a valve of this character, whereby the air ports supplying a proper amount or air to be mixed with the gas, may be automatically adjusted with relation to the adjustment of the valve proper and the gas port, so that when the valve is only partly opened the area of the gas port will be restricted and the area of the air ports will be correspondingly restricted, and when the valve is wide open the area of the gas port will be of maximum size and the area of the air ports will also be of maximum size, to therebymaintain the same proportions of gas and air under all positions of the valve proper.

More specifically in this connection, it is my object to provide convenient, facile and economical means for operating the air ports and for adjusting the air ports relative to the gas port, without the necessity of taking the entire valve apart and without the use of tools, and whereby under all conditions of gas pressure inthe gas supply pipes the valve may be adjusted to give a properly proper proportion'relative thereto, and also the air ports may be independently adjusted,

whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims, and illustrated in the accompanying drawings, in which:

Figure 1 shows a vertical, central, sectional view of an air and gas mixing valve embodying my invention.

Figure 2 shows a horizontal, central, sectional view of same, part of the mixing chamber being broken away.

Figure 3 shows a front view of a valve device embodying my invention. The dotted lines show the position of the several parts when the main gas valve is turned at right angles to its original position.

Figure 4 shows a front view of. the ing chamber with the air controlling plate removed, illustrating the air ports therein.

bigure 5 shows a like view of the adjustable plate for controlling the air ports; and

Figure 6 shows a side elevation of a valve embodying my invention.

.ltelerring to the accompanying drawings, 1 have used the reference numeral 10 to in dicate the body of the gas controlling valve. It is provided with a tapered vertical opening to receive a valve stem, and also a longitudinal opening through which the may flow. The valve stem is indicated by the numeral 11, and is provided with a handle 12 at its top. The longitudinal gas passageway is indicated by the numeral 13. The discharge end of the valve body is screwthreaded on its exterior at 14C, and on its interior is an enlarged chamber, which is also having its sides inclined inwardly so that when the sides are sprung together there will be a small discharge opening, and when the sides are released they will spring apart and form a wide discharge opening.

Arranged between the part 15 and the valve stem 11 is a short tubular section 16, slidingly mounted and having its end in engagement with the valve stem. Une side of the valve stem is flattened at 17, adjacent to the discharge end of the gas passageway 18 through the valve stem. Screwed into the opening at the discharge end of the valve body, and surrounding the part 15, is a hollow plug device 19, having a small disadjacent to the opening tapered at 20 to en ge the end of the part 15. These parts are so arranged that when the valve is in its closed position, as shown in Figure 2, the port regulating device 15 will be "forced against the tapered part 20 of the plug 19, and the gas discharge opening will. be almost closed. However, when the valve is'turned to position right angles to that shown in Figure 2, then the resiliency of the part 15 will cause it to move to the position shown in Figure l, by engagement with the tapered portion 20, thus leaving a wide discharge opening or gas, as shown in Figure 1.

This part oi the device forms no part of my present invention, and is herein illu trated and desc *ibed in detail only for the purpose of showing its coaction with the mechanism for controlling the air regulating ports.

Surrounding the inner end of the valve stem is a mixing chamber 21, which is screwed to the exterior of the valve stem, and rotatably mounted upon it is a circular air controlling plate 2-1. The flat face of the mixing chamber 1 is provided with segmental openings 23, and the plate 22 is provided with corresponding segmental openings 24, the parts being so arranged that when in one position the openings 23 and 24- will coincide, and in another position the openings 24 will lie adjacent to the spaces between the openings 23, and the air passageways will be closed.

Formedin the plate 22 is a series of openings 25, arranged in line concentric with the plate 22, and detachably mounted in one of these openings is a pin 26 having a tapered outer end.

At the lower end of the valve stem 11 there is a washer 27, an extensible coil spring 28, an outer washer 29 and a screw 30 extended through the washer 29 and seated in the valve stem. Between the washer 29 and the end or" the valve stem is a flat arm 31,

provided with a pin 32 to enter an opening in the valve stem for holding said arm 31 against rotation relative to the valve stem. The said arm 31 is provided with a part 38 extended inwardly toward the air regulating plate 22, and this part 33 is provided with a slot 34 designed to receive the pin 26.

In practical operation, and assuming that the parts are assembled as shown in the drawings, and assuming further that the gas valve is in its closed position, then the gas port will be of minimum diameter and the air ports will be closed. Then as the main valve stem is moved to open position, the gas port will be proportionately increased in size, and the air controlling plate 22 will be progressively advanced to bring its air ports 24 into coincidence with the air ports 22 of the end plate of the mixing chamber, by reason oi, the slotted arm on the valve stem engaging the pin 26. In this connection, it is understood that the slot in said arm permits the said pin to slide relative to the slot, so that the parts are kept in working engagement during the entire opening movement of the air controlling plate.

In the event that it should be desirable to change the relative position of the air port to the gas port, due: to a dill'erencv in gas pressure or for other Masons. this may be accomplished by my improved constru tion v ry readily, quickly and easily and without the use of tools, by simply removing the pin26 from its opening 25 and placing it in another one oi said openings, and this may be done without disconnecting any of the other parts oi he device.

I claim as my invention:

1. In a device of the class described, the combination of a valve body, a valve stem therein. an adjustable gas port controlled by the n'iovement of the gas valve, a mixing chamber having an air port, a circular plate rotatably mounted on the mixing chamber and having an air port to coincide with that of the mixingchamber, a series of openings in the air controlling plate, a pin detachably mounted in one of said openings and capable oil being rtmoved and placed in any other of said openings, and an arm fixed to the valve stem and having a slotted extension, into which slot the said pin is inserted. and whereby a movement of the valve stem will rotate the air plate by reason of its engagement with said pin, whereby the relative positions of the air port and gas port may be adjustcd by placing said pin in different ones of the openings in the air controlling plate, for the purposes stated.

2. In a device of the class described, the combination of a valve body, a valve stem therein, an adjustable gas port controlled by the movement of the gas valve, a mixing chamber having an air port, a circular plate rotatably mounted on the mixing chamber and having an air port to coincide with that of the mixing chamber, there being a series of openings in the air controlling plate, :1 pin detachably mounted in one of said openings and capable of being removed and placed in any other of said openings, and an arm fixed to the valve st-zm and designed to engage said pin. whereby a movement of the valve stem will rotate the air plate by reason of its engagement with said pin. whereby the relative positions of the air port and gas port may be adjusted by placmg said pin in different ones of the openings in the air controlling plate, for the purposes stated.

Des Moines. Iowa, Februarv 8, 1921,.

TOM E. ROOKE. 

